Well, as far as I'm concerned, Friends is the best of all of those shows mentioned. Jennifer Aniston's acting is, well, Jennfier Aniston acting to the best of her abilities, but the show is the best sitcom ever.
Your comment on Live's blog reminded me of a story.
My boyfriend and I are polar opposites on sitcom-watching. I can debate the merits of Friends vs. Family Ties vs. Roseanne vs. How I Met Your Mother and he probably doesn't even know half of those names. But one night I turned on The Nanny because I really really needed my sitcom fix and he watched some with me and then I fell asleep. Turns out he watched every episode of The Nanny that came on that night, and then every episode of Roseanne afterwards, until they start repeating. I lol'd.